Ridge horn have been utilized in antenna test ranges for different measurement applications for many years. These horns offer stable performance on a bandwidth that can exceed 16:1 as reported in [1–2]. The quad-ridge horn offer dual polarization in the same horn but often at the expense of bandwidth [1]. The open boundary horn concept investigated in [3] is preferred since it avoid the frequency dependent influence of the horn walls that often lead to pattern deformation. The design task is often a compromise between pattern shape, matching and polarization purity but also mechanical issues needs to be considered to arrive at a robust design with repeatable and stable performance. This paper describes the design of a 2–32GHz dual polarized quad ridge horn with a 16:1 bandwidth with high polarization purity.
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